<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{ height: wh + 'px' }">
        <view class="left-scroll-view-item" :class="{ active: index === active }" v-for="(item, index) in cateList" :key="index" @click="activeChanged(index)">
          {{ item.cat_name }}
        </view>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
        <view class="left-scroll-view-item" v-for="(item2, index2) in cateLevel2" :key="index2">
          <view class="cate-lv2-title">{{ item2.cat_name }}</view>
          <!-- 循环三级分类 -->
          <view class="cate-lv3">
            <navigator :url="`/subpkg/goods_list/goods_list?cid=${item3.cat_id}`" class="cate-lv3-item" v-for="(item3, index3) in item2.children" :key="index3">
              <image :src="item3.cat_icon"></image>
              <view class="text">{{ item3.cat_name }}</view>
            </navigator>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
import tabbarBadge from '@/mixins/tabbar-badge.js'
export default {
  name: 'CatePage',
  mixins:[tabbarBadge],
  components: {},
  data() {
    return {
      // 窗口的可用高度 = 屏幕高度 - navigationBar高度 - tabBar 高度
      wh: 0,
      cateList: [],
      active: 0, //当前激活的分类的索引
      cateLevel2: [],
      // 滚动条距离顶部的距离
      scrollTop: 0
    };
  },
  created() {},
  mounted() {},
  onLoad() {
    // 获取当前系统的信息
    const sysInfo = uni.getSystemInfoSync();
    // 为 wh 窗口可用高度动态赋值
    // console.log(sysInfo)
    this.wh = sysInfo.windowHeight;
    this.getCateList();
  },
  methods: {
    // 跳转到分包中的搜索页面
    gotoSearch() {
      console.log('222')
      uni.navigateTo({
        url: '/subpkg/search/search'
      });
    },
    async getCateList() {
      let {
        data: {
          message,
          meta: { status }
        }
      } = await uni.$http.get('/api/public/v1/categories');
      console.log(message);
      if (status !== 200) return uni.$showMsg();
      this.cateList = message;
      this.cateLevel2 = this.cateList[0].children;
    },
    activeChanged(index) {
      this.active = index;
      this.cateLevel2 = this.cateList[index].children;
      // 让 scrollTop 的值在 0 与 1 之间切换
      // vue改变数据,两次值一样,不是响应式
      this.scrollTop = this.scrollTop === 0 ? 1 : 0;
    }
  }
};
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 24rpx;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3 {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
}
</style>
